2011.08.12（4）——— android AudioTrack 不能播放awr

2011.08.12（4）——— android audiotrack 不能播放awr
[url=http://blog.sina.com.cn/s/blog_7cb539590100qkcr.html]http://blog.sina.com.cn/s/blog_7cb539590100qkcr.html[/url]
[url=http://blog.youkuaiyun.com/chenjie19891104/article/details/6333553]http://blog.youkuaiyun.com/chenjie19891104/article/details/6333553[/url]
[url=http://blog.youkuaiyun.com/hellogv/article/details/6026455]http://blog.youkuaiyun.com/hellogv/article/details/6026455[/url]

我用audiotrack播放mp3 awr都是不成功的 只会传出一堆的噪声，但是播放wav是没有问题的，因为wav就相当于原生态的pcm

这时候 我有两个选择

1、从3gp网站上下载awr解码算法 用jni调用 把awr解码成pcm
2、可以用audiorecord来录制pcm 并用audiotrack来播放

我用的时后者

package com.lp;import java.io.bufferedinputstream;import java.io.bufferedoutputstream;import java.io.datainputstream;import java.io.dataoutputstream;import java.io.file;import java.io.fileinputstream;import java.io.fileoutputstream;import java.io.ioexception;import android.app.activity;import android.media.audioformat;import android.media.audiomanager;import android.media.audiorecord;import android.media.audiotrack;import android.media.mediarecorder;import android.os.asynctask;import android.os.bundle;import android.os.environment;import android.util.log;import android.view.view;import android.view.view.onclicklistener;import android.widget.button;import android.widget.textview;public class mainactivity extends activity implements onclicklistener{		private textview stateview;		private button btnstart,btnstop,btnplay,btnfinish;		private recordtask recorder;	private playtask player;		private file audiofile;		private boolean isrecording=true, isplaying=false; 		private int frequence = 44100; 	private int channelconfig = audioformat.channel_configuration_mono;	private int audioencoding = audioformat.encoding_pcm_16bit;			public void oncreate(bundle savedinstancestate){		super.oncreate(savedinstancestate);		setcontentview(r.layout.main_pcm);				stateview = (textview)this.findviewbyid(r.id.view_state);		stateview.settext("准备开始");		btnstart = (button)this.findviewbyid(r.id.btn_start);		btnstop = (button)this.findviewbyid(r.id.btn_stop);		btnplay = (button)this.findviewbyid(r.id.btn_play);		btnfinish = (button)this.findviewbyid(r.id.btn_finish);		btnfinish.settext("停止播放");		btnplay.setenabled(false);		btnfinish.setenabled(false);		btnstart.setonclicklistener(this);		btnstop.setonclicklistener(this);		btnplay.setonclicklistener(this);		btnfinish.setonclicklistener(this);		//		file fpath = new file(environment.getexternalstoragedirectory().getabsolutepath()+"/11");//		fpath.mkdirs();		try {			//audiofile = file.createtempfile("test", ".pcm", fpath);			audiofile = new file("/mnt/sdcard/1.pcm");		} catch (exception e) {			// todo auto-generated catch block			e.printstacktrace();		}			}			public void onclick(view v){		int id = v.getid();		switch(id){		case r.id.btn_start:						recorder = new recordtask();			recorder.execute();						break;		case r.id.btn_stop:			this.isrecording = false;			system.out.println(isrecording);			break;		case r.id.btn_play:						player = new playtask();			player.execute();			break;		case r.id.btn_finish:			this.isplaying = false;			break;					}	}		class recordtask extends asynctask<void, integer, void>{		@override		protected void doinbackground(void... arg0) {			//isrecording = true;			try {				//开通输出流到指定的文件				dataoutputstream dos = new dataoutputstream(new bufferedoutputstream(new fileoutputstream(audiofile)));				//fileoutputstream fos = new fileoutputstream(audiofile);				//根据定义好的几个配置，来获取合适的缓冲大小				int buffersize = audiorecord.getminbuffersize(frequence, channelconfig, audioencoding);				//实例化audiorecord				audiorecord record = new audiorecord(mediarecorder.audiosource.mic, frequence, channelconfig, audioencoding, buffersize);				//定义缓冲				short[] buffer = new short[buffersize];				//byte[] buffer = new byte[buffersize];								//开始录制				record.startrecording();								int r = 0; //存储录制进度				//定义循环，根据isrecording的值来判断是否继续录制				while(isrecording){					//从buffersize中读取字节，返回读取的short个数					//这里老是出现buffer overflow，不知道是什么原因，试了好几个值，都没用，todo：待解决					int bufferreadresult = record.read(buffer, 0, buffer.length);					//循环将buffer中的音频数据写入到outputstream中					for(int i=0; i<bufferreadresult; i++){						dos.writeshort(buffer[i]);					}					//					byte[] tmpbuf = new byte[bufferreadresult];  //                    system.arraycopy(buffer, 0, tmpbuf, 0, bufferreadresult); //                    fos.write(tmpbuf, 0, bufferreadresult);//                    fos.flush();					publishprogress(new integer(r)); //向ui线程报告当前进度					r++; //自增进度值				}				//录制结束				record.stop();				system.out.println("the file length::"+audiofile.length());				dos.close();				//fos.close();			} catch (exception e) {				// todo: handle exception			}			return null;		}				//当在上面方法中调用publishprogress时，该方法触发,该方法在ui线程中被执行		protected void onprogressupdate(integer...progress){			stateview.settext(progress[0].tostring());		}				protected void onpostexecute(void result){			btnstop.setenabled(false);			btnstart.setenabled(true);			btnplay.setenabled(true);			btnfinish.setenabled(false);		}				protected void onpreexecute(){			//stateview.settext("正在录制");			btnstart.setenabled(false);			btnplay.setenabled(false);			btnfinish.setenabled(false);			btnstop.setenabled(true);				}			}		class playtask extends asynctask<void, integer, void>{		@override		protected void doinbackground(void... arg0) {			isplaying = true;			int buffersize = audiotrack.getminbuffersize(frequence, channelconfig, audioencoding);			short[] buffer = new short[buffersize/4];			//byte[] buffer = new byte[buffersize];			try {				//定义输入流，将音频写入到audiotrack类中，实现播放				datainputstream dis = new datainputstream(new bufferedinputstream(new fileinputstream(audiofile)));				//fileinputstream fis = new fileinputstream(audiofile);				//实例audiotrack				audiotrack track = new audiotrack(audiomanager.stream_music, frequence, channelconfig, audioencoding, buffersize, audiotrack.mode_stream);				//开始播放				track.play();				//由于audiotrack播放的是流，所以，我们需要一边播放一边读取				while(isplaying && dis.available()>0){					int i = 0;					while(dis.available()>0 && i<buffer.length){						buffer[i] = dis.readshort();						i++;					}					//然后将数据写入到audiotrack中					track.write(buffer, 0, buffer.length);									}								//播放结束				track.stop();				dis.close();			} catch (exception e) {				// todo: handle exception			}			return null;		}				protected void onpostexecute(void result){			btnplay.setenabled(true);			btnfinish.setenabled(false);			btnstart.setenabled(true);			btnstop.setenabled(false);		}				protected void onpreexecute(){							//stateview.settext("正在播放");			btnstart.setenabled(false);			btnstop.setenabled(false);			btnplay.setenabled(false);			btnfinish.setenabled(true);					}			}}

对了 别忘了权限

<uses-permission android:name="android.permission.modify_audio_settings" />    <uses-permission android:name="android.permission.write_external_storage" /> 	<uses-permission android:name="android.permission.record_audio" />